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Radiology Research and Practice
Volume 2014 (2014), Article ID 347416, 5 pages
http://dx.doi.org/10.1155/2014/347416
Research Article

Continuous Dynamic Registration of Microvascularization of Liver Tumors with Contrast-Enhanced Ultrasound

Department of Radiology, University Medical Center of Regensburg, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany

Received 17 December 2013; Revised 9 April 2014; Accepted 23 April 2014; Published 2 June 2014

Academic Editor: Sotirios Bisdas

Copyright © 2014 Lukas Philipp Beyer et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aim. To evaluate the diagnostic value of quantification of liver tumor microvascularization using contrast-enhanced ultrasound (CEUS) measured continuously from the arterial phase to the late phase (3 minutes). Material and Methods. We present a retrospective analysis of 20 patients with malignant ( ) or benign ( ) liver tumors. The tumors had histopathologically been proven or clearly identified using contrast-enhanced reference imaging with either 1.5 T MRI (liver specific contrast medium) or triphase CT and follow-up. CEUS was performed using a multifrequency transducer (1–5 MHz) and a bolus injection of 2.4 mL sulphur hexafluoride microbubbles. A retrospective perfusion analysis was performed to determine TTP (time-to-peak), RBV (regional blood volume), RBF (regional blood flow), and Peak. Results. Statistics revealed a significant difference ( ) between benign and malignant tumors in the RBV, RBF, and Peak but not in TTP ( ). Receiver operating curves (ROC) were generated for RBV, RBF, Peak, and TTP with estimated ROC areas of 0.97, 0.96, 0.98, and 0.76, respectively. Conclusion. RBV, RBF, and Peak continuously measured over a determined time period of 3 minutes could be of valuable support in differentiating malignant from benign liver tumors.